Clean Power. It is worth investing in a good surge protector powerboard.
A good one may cost around $100 or more. But if you are protecting $2,000 worth of equipment and more importantly the images you have stored it is worth it.
Temperature and Humidity.
Computers do not like getting too hot. So keep yours in a room under 30c (preferable under 25c).
Be careful with notebooks when you travel. Let it settle for a couple of hours if there is a big change in temperature or humidity. (The same goes for cameras).
If there is a lightning storm nearby it is worth turning off equipment and disconnecting it at the wall until the storm passes. Don't forget to also un-plug any telephone lines.
Clean your PC.
Computers hate dust, it causes heat build up which can damage your system.
Here are some links to article on cleaning your equipment.
DON'T USE A VACUUM CLEANER - It will cause a static build up that will fritz (technical term) your system!!
Cleaning Notebook or Other Monitors
This thread http://www.ausphotography.net.au/for...ad.php?t=21736
Key things to watch out for...
a) Power off
b) Don't spray anything directly onto the screen, spray onto soft cloth or microfiber cloth
c) Don't press to hard
d) Avoid solvents, including Windex, especially for coated screens!